Henry green



(No Model.)

H. GREEN. INOANDBSGBNT LAMP.

No. 495,467. Patented Apr. 11,1893.

henfar'x UNITED STATES PATENT OFFICE.

HENRY GREEN, OF HARTFORD, CONNECTICUT, ASSIGNOR OF ONE-HALF TO GEO. S.MILLER, OF SAME PLACE.

INCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 495,467, dated April11, 1893.

Application filed October 16 1891.

To all whom it may concern.-

Be it known that I, HENRY GREEN, a citizen of the United States,andaresidentof Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inIncandescent Electric Lamps, of which the following is a specification.

"This invention has relation to an improvement in incandescent electriclamps, and it has for its object to so construct a lamp that a vacuummay be formed in the globe repeatedly thereby rendering such. a lampinexpensive, inasmuch as the consumer might use the same globe or bulbindefinitely by having the vacuum recreated as it becomes lost by use.

A further object of the invention is to render the globe capable ofbeing cleaned on the inside.

Another object of the invention is to supply a cheap and reliable methodof forming the exterior terminals of the leading in wires, by means ofattaching to a disk, formed partly of insulation, and partly of metal,at the head of the stopper.

Other objects and advantages will appear from the following description,and claims when taken in connection with the annexed drawings, in which:

(Figure 1) is a side view of an incandescent lamp in section. (Fig. 2.)is a side view of the stopper. (Fig. 3.) is aperspective view of thewrench.

Referring to said drawings by letters, (A) indicates the globe which maybe of any ordinary form, and (a. a.) the filament.

(B) indicates the neck which is made thicker at its top for the purposeof allowing sufficient ipace for the insertion of the point (L. Fig. 3

(C) indicates the stopper which is also made of glass and ground in,having a longitudinal groove (G) on the lower part of its outer surfacepreferably brought to a needle point at its upper end, and whichregisters in and out with the funnel shaped aperture (E) for the purposeof opening and closing communication with the interior of the globe, apassage Serial No. M8824. (N0 model.)

being had between the contact surfaces of the stopper and globe.

f.f.f. fFig. 2. are four little balls or projections of glass set atright angles with each other to facilitate the use of awrench or othersimilar device when turning the stopper in and out of registration withthe aperture in the globe.

(H. Fig. 3.) indicates aband or clip designed to encircle the outer neckof the globe for the purpose of securing the point (L) in its positionin the funnel shaped aperture (E) while exhausting the lamp.

((1) indicates a disk of insulating material which is secured at thehead of the opening in the stopper (C) through which the wires pass andare secured at the outer side to two disks or plates of metal (on. m.Fig. 2.) and at which said wires terminate.

(I Fig. 3.) is a block forming part of the clip (H) through which thetube (K) passes and is held firmly in the aperture (E) by the thumbscrew (j).

I am aware that incandescent lamps with stoppers having perforations andair tubes therein as in Fox and Bohms patent No.

248,156, of October 11, 1891, have heretofore been made. I am also awarethat such lamps have been made with permanently attached exhaust tubesand that disks of insulation have been used, but I am not aware that acombination as described in the foregoing specification has been used. Ido not therefore claim a stopper lamp broadly but only such stopperlamps which contain any or all of my improvements as herein specified.

Having thus described my invention, what I claim is 1. In anincandescent electric lamp, the combination with the bulb or vacuumchamber,

formed with a heavy neck having a funnel 9o shaped aperture (E) in itsside, of a stopper with a longitudinal groove traversing the lower halfof the exterior thereof, opening and closing a passage between thestopper and the neck, and the disk of insulation (d) with smaller disksof metal (m, m,) on its upper or outer surface at which point theextreme outer ends of the leading in wires terminate, and

the outer portion of the stopper provided with which the leading inwires are attached and means whereby a Wrench or its equivalentterminated, to form the finished lamp termimay be used to overcome theresistance When nalsubstantially as herein described. rotating saidstopper within the neck of said Signed at Hartford, in the county ofHart- 15 5 vacuum chamber-substantially as shown, ford and State ofConnecticut, this 16th day and described. of September, A. D. 1891.

In an incandescent electric lamp, having the bulb (A) the heavy neck (B)the stopper HENRY GREEN. (0) in combination with the disk of insulationWitnesses: I0 (d) with smaller disks of metal (m. m.) on its' F. S.FRENCH, exterior surface, or running through it to; F. H. ANNIs.

